It may not be TPG to blame. Could be any part of the delivery structure.
Are you on FTTP? If so, is the optical light on your NTD flashing green?
Apologies! Have now seen your screenshot. You are on FTTN.
The weakest link on FTTN is the copper 'last mile', where the joints are typically dodgy
But your screenshot shows phone OK and if phone is OK and is delivered down the FTTN that suggests a possible modem problem. Does a modem reboot work?